Class methods must always mention the class variable
As mentioned in ticket:7854#comment:96716, GHC wrongfully accepts the following program. It should reject it, because op
doesn't mention any type variables of Foo
(the method context doesn't count).
module ShouldFail where
class Foo a where
op :: Eq a => Int
I'm working on it.
Trac metadata
Trac field | Value |
---|---|
Version | 7.10.1-rc2 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler (Type checker) |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |